Actually Tony I think your idea should work because I listened to the cd today and it's a clicking sound but the music and words are still intact. I hear the clicking at times along with the songs i.e. no missing music or words.
I can't go out and buy a new copy because it's a bootleg cd of Zeppelin so the manual labor will be worth it! The quality of the show is phenominal one of the soundboard recordings I've ever heard!